Frank Corrigan is a Homicide Detective in San Francisco. He and his partner, Lee Fralick, are assigned to investigating the double murder of a friend of Fralick and what turns out to be his mistress / business partner in a call girl ring. Obviously the number one suspect becomes the dead man's wife who claims to have been unaware of her husband's secret life. When other people connected loosely to the murder victims also start turning up dead, the case really heats up. This story has more twists and turns than the crookedest road in the world and has the reader baffled as to who the killer is. Shadows of doubt are cast on many of those under suspicion.